how accurate is nub theory??

[Butterflyy20]

just out of curiosity I paid for two companies to do the "nub" theory! never did it with my son, they've both come back as girls! do they look like girls to you? Also how accurate is this??? i did sneak peek and got a boy so very skeptical lol
i've put the normal one and the one they've marked up! TIA.

I’d have thought boy to be honest but nubologists probably know better than me

I agree with the girl result. Definitely looks like two totally horizontal line.